Burner for air heaters



BURNER FOR AIR HEATERS Filed May 51. 1927 al1/fulfil? \\\\\\\\\\\\\\\\\\\\\S /n ven tofs.'

Patented Jan.. 17, 1928.

UNITED STATES PATENT OFFICE. f

JULIUS STOECKER .AND ARTHUR REIN, 0F BOCHUM, GERMANY, ASSIGNORS TO AS- KANIA-WERIKE A.G. VORMALS CENTRALWERKSTATT DESSAU UND CARL BAM- BERG-FRIEDENAU, OF BERLIN-FRIEDENATI, GERMANY, A CORPORATION F GER- MANY.

Application led May 31, 19271 Serial No. 195,524, and in Germany May 31, 1926.

Since purified blast-furnace waste-gas has been used for the heating of air-heaters, boilers, furnaces and other stoves, a large variety of large gas-burners has been used which, indeed, have proved successful in counection with boilers and furnaces in which the draught conditions in the combustion chamber are approximately equal and the service is carried through uninterruptedly.

lo But as regards the employment of said burners in connection with air-heaters for heating compressed air, especially Cowper stoves, the conditions are less favorable, in that with them the combustion chamber, after the rel factory checker-Work or the like enclosed therein has been re-heated, must be put under pressure during the air-heating period.` The air shutting-oli' devices of most of the known large gas burners are, however, more or less l0 designed as regulating devices and not at once suited forthe shutting-oit of air compressed up to 1' atmosphere.' Another unsatisfactory feature is this, that simple slidevalves or conical closures do not suilice at l5 all to prevent the air from entering, reversely to the waste-gas, into the Waste-gas pipe where then the extraordinarily dangerous detonatinggas could be formed. These are the reasons Why gas-burners that had proved o -well suited for boilers and furnaces proved unsuited for air-heaters.

Blast-furnace engineers employ in general, for the sake of the security ot' the service, the. turnable or portable waste-gas bend with 5 water-seal and slide-valves in connection with Schmidt-s spectacle valve, and there are many cases in which, besides, the Waste-gas supply and the combustion air supply are separated from one another. The disadvantage of this arrangement lies chiefly in the great loss of time when changing-over. y

Also two slide-valves have been arranged one behind the other in order to' prevent the air from entering into the gas-conduit.

i The changing-over time is shorter, it is true,

but the pr: :e-cost s too high. The idea, einbodied in that arrangement and combination of slide-valves has.l finally, been modified in this `Way that a double plate slide-valve i has been designed in which the space between the two slide-valves is relieved so that, entrance of compressed air into the gas-corduit is impossible. This rendered it possible to change-over the air-heater mechanicalspeCtiVely, and al the slide-valve.

extraordinarily simple Aarrangement which'- constitutes a. .solution -ot' the problem of shutting the burner opening in the simplest manner by means ofan ordinary slide-valve without any danger of air entering into the gas-conduit. This is attained by the arrangement that-the air suction nozzle, or the nozzle blowing in the combustion air respectively, which together with the gas pipe forms an injector-like apparatus opens into the atmospheric air and can be shut-off from the air-heater by means ot' a slide-valve in such a manner that when the air-heater is subjected to internal pressure by the compressed air that amount of the air which escapes through leaky portions of that slidevalve can escape directly into the atmosphere, so that no pressure can possibly accumulate in the heater and enter into the gas conduit. The Schmidts spectacle valvewith its circumstantial manipulation, and the expensive double plate slide-valve for separating reliably the air-heater and the gas-conduit from each other are, thus, dispensed with, as are also the otherwise much used two airclosures, and the change-over time is consid-- erably reduced bythe rapid-closing slidevalve forming the sub ject-matter of the present invention.

The invention is illustrated diagrammatically and by way of example on the accompanying drawing on which it is shown partly in side-view and partly in vertical sccton.

On the drawing, a. denotes the burner opening of the air-heater 7), and c denotes the suction nozzle, or blowing-in nozzle re- The gaspipe e can be closed, as usual, by a slidevalve f and its end g terminates freely into the nozzle c. During that period in which the air-heater is re-heated the combustion-air required is sucked in through the nozzle c and is introduced into the air-heater through the burner opening a, the slide-valve d being then open. Thereafter the slides f and d are closed and the air-heater can now loe subjected to the internal pressure. `It is obvious that air escaping through the slide d cannot possibl enter into the gas-pipe e but esca es into t e atmos here.

T e gas-burner may e of any desired design, which is true also of the means for regulating the amounts of the gas and the all'.

We claim: l

1. A burner for air-heaters, or Cowper stoves, to be alternately reheated and supplied with air under pressure to be heated, comprising, in combination `with the airheater and its burner opening, a nozzle for supplying the combustion-air opening into the atmospheric air, a gas-supply nozzle combined with said air nozzle to form an injector-like apparatus, a valve adapted to close the gas-supply and a second valve ar- 20 ranged between said burner opening and said injector-like apparatus and adapted to close the said opening.

2. A burner -for airheaters, or Qowper stoves, to be alternately reheated. an Supl plied with air under pressure to be heated comprising, in combination with the airheaterand its burner opening, a. nozzle for supplying the combustion-air opening into the atmospheric air, a gas-supply nozzle terminating 1n a butt-like manner into the firstmentioned nozzle so that the two nozzles form an injector-like apparatus, a valve adapted to close the gas-supply and a second valve arranged between said burner opening and saidinjector-like apparatus and adapted to close the said opening.

In testimony whereof We have aixed our signatures.

JULIUS STOECKER. ARTHUR REIN. 

